Claims
- 1. A method by which a radio receiver (10), in receiving a signal transmitted over a radio channel, estimates the impulse response of the radio channel based on a received training sequence (Y) included in the received signal, the method including a step (102) of performing a plurality of correlations of a correlation sequence (Yc″) derived from the received training sequence (Y) with a replica (X0) of the transmitted correlation sequence, characterized by a step (101) of calculating the received correlation sequence (Yc″) derived from the received signal based on averaging symbols of the received training sequence (Y).
- 2. A method for estimating the impulse response (c(t)) of a radio channel by which a radio receiver (10) receives a received signal including a received training sequence (Y) for which the radio receiver (10) knows a corresponding replica training sequence (X0), the received training sequence (Y) including a correlation sequence (Yc) having a first end and a second and, and also including an additional part (Ya2) at the second end, with the additional part (Ya2) the same as a corresponding portion (YC1) of the correlation sequence (YC) at the first end of the received correlation sequence (YC), and likewise for the replica training sequence (X0) so that it includes a replica correlation sequence (X0,c), the method characterized by:
a) a sequence-calculating step (101), responsive to the received training sequence (Y), of forming a calculated correlation sequence (YC″) by averaging a predetermined number of symbols (YC1) from the first end of the received correlation sequence (YC) with a predetermined number of corresponding symbols from the additional part (Ya2) at the second end of the received training sequence (Y); and b) a correlating step (102), responsive to the calculated correlation sequence (YC″), of performing a set of correlations of the calculated correlation sequence (YC″) with the replica training sequence (X0), the set of correlations including a first correlation in which the calculated correlation sequence (YC″) is aligned with the replica correlation sequence (X0,c) and including subsequent correlations performed with the calculated correlation sequence (YC″) shifted for each next correlation by one or more symbols from the position in the immediately preceding correlation, so as to provide information useful in estimating the channel impulse response (c(t)).
- 3. A receiver (10), characterized in that it is operative according to the method of claim 1.
- 4. A receiver (10), characterized in that it is operative according to the method of claim 2.
- 5. A telecommunication system, including a base transceiver station and a user equipment, both of which include a receiver (10), characterized in that both receivers (10) are operative according to the method of claim 1.
- 6. A telecommunication system, including a base transceiver station and a user equipment, both of which include a receiver (10), characterized in that both receivers (10) are operative according to the method of claim 2.
- 7. A computer program product comprising: a computer readable storage structure embodying computer program code thereon for execution by a computer processor in a receiver (10), with said computer program code characterized in that it includes instructions for performing steps of a method according to claim 1.
- 8. A computer program product comprising: a computer readable storage structure embodying computer program code thereon for execution by a computer processor in a receiver (10), with said computer program code characterized in that it includes instructions for performing the steps of a method according to claim 2.
CROSS REFERENCE TO RELATED APPLICATION
[0001] Reference is made to and priority claimed from U.S. provisional application Ser. No. 60/423,851, filed Nov. 5, 2002, entitled METHOD AND APPARATUS FOR ESTIMATING THE IMPULSE RESPONSE OF A RADIO CHANNEL BASED ON A CALCULATED CORRELATION SEQUENCE.
Provisional Applications (1)
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Number |
Date |
Country |
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60423851 |
Nov 2002 |
US |